Accrued Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accrued Liabilities, Current [Abstract]
Interest	$ 35,406	$ 28,246
Employee related costs	98,101	119,931
Other accrued expenses	120,072	105,909
Total accrued liabilities	$ 253,579	$ 254,086